Tiger Woods thwarted his ex-mistress Rachel Uchitel's $300,000 payday to appear nude in a men's magazine by threatening to overturn her multi-million dollar settlement with him.

"It put Rachel in significant danger of losing the millions of dollars Tiger paid her," a source close to the situation told RadarOnline.com. "The magazine wanted to mention Rachel's relationship with Tiger, but it would have jeopardized the deal she already made with him. They refused to give her complete control of the cover so she could make sure Tiger wasn't mentioned."

Those conditions jeopardized Uchitel's deal with Tiger, and she quickly realized there was no way to pose for Playboy without taking an enormous financial risk. Had Uchitel gone forward with the men's magazine shoot she was to appear "totally naked except her pubic area," the source told RadarOnline.com.